Re: Half Fibre Pair

[Matthew Petach <mpetach () netflight com>]

You can see the terminology getting referenced in articles such as this one
from Telegeography:

https://www.submarinenetworks.com/en/insights/a-new-coming-for-submarine-cable-systems-the-independent-infrastructure-developers

"Further PLCN incorporates Spectrum Manager, that allows the C+L band to be
sliced into blocks of spectrum that can be independently assigned to
separate SLTE that is owned, operated and upgraded by the party leasing the
spectrum. PLCN has productized it in terms of Minimum Spectrum Unit (MSU)
which is 5% of the total C+L band capacity i.e. 5% of 240x100G or 1.2 Tbps.
It’s extended further as virtual fiber pair with Quarter Fiber Pair as
5xMSU or 6 Tbps and Half Fiber Pair as 10xMSU or 12 Tbps. This notably is
not unique to PLCN and is supported by most [of] the cable systems designed
post 2015 or supported with upgrades."





On Tue, Jan 26, 2021 at 2:49 PM Rod Beck <rod.beck () unitedcablecompany com>
wrote:

> Actually it is standard language in the undersea cable world for a large
> spectrum purchase. Sometimes a fiber pair on a system may be too much, but
> the buyer still wants many terabits of capacity. "
>
> The Half Fiber Pair is the same as 10*MSUs in a virtual fiber pair, either
> in C-band or L-band. I believe these are primarily used in transocean
> routes."
>
>
> This is what I have learned so far.
>
>
> Now that deep sea cables are being deployed with as many as 24 pairs,
> there will be more players doing fractional purchases.
>
>
>
>
>
> ------------------------------
> *From:* William Herrin <bill () herrin us>
> *Sent:* Tuesday, January 26, 2021 10:56 PM
> *To:* Rod Beck <rod.beck () unitedcablecompany com>
> *Cc:* nanog () nanog org <nanog () nanog org>
> *Subject:* Re: Half Fibre Pair
>
> On Tue, Jan 26, 2021 at 12:52 PM Rod Beck
> <rod.beck () unitedcablecompany com> wrote:
> > Can someone explain to me what is a half fibre pair? I took it
> > literally to mean a single fibre strand but someone insisted it
> > was a large quantity of spectrum. Please illuminate.
>
>
> Maybe it's like half a pair of glasses, the perfect accessory for the
> one-eyed man who's king.
>
> Seriously though, it sounds like a bad language construction. If a
> vendor is offering you that, I'd ask for clarification. Are they
> leasing a dedicated strand of fiber end-to-end? Dedicated wavelength
> directions delivered by fiber? Something else?
>
> If you're thinking of offering it, find better words.
>
> Regards,
> Bill Herrin